I’ve been wondering the same thing. At the moment I’m just looping over an array of the channels I want to retrieve information about, with an individual http: request for each one.
As you mentioned above, you can get information about multiple streams in one request. https://github.com/justintv/Twitch-API/blob/master/v3_resources/streams.md#get-streamschannel
Unfortunately, if the channel isn’t streaming at the time of the request, the response doesn’t provide the information I need about the channels. So I’m stuck with doing 25+ separate channel http requests (and requesting the streaming information separately).